XK8 / XKR ( X100 ) 1996 - 2006

Top opens and windows go down when the battery is hooked up

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Old Dec 30, 2025 | 05:35 PM
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Default Top opens and windows go down when the battery is hooked up

2003 XKR. If the battery is disconnected and then reconnected, the top and windows go down every time. Easy enough to put back up but this does not seem normal.
Any ideas? I think this also happens when you unlock the drivers door using the key and not the FOB.
Thanks
 
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Old Dec 30, 2025 | 07:33 PM
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Regarding the driver's door, it is normal if you turn the key one way and hold it then the windows will go down as will the top. Your lock may be sticking if it affects the top with just a momentary turn to unlock the door.
 
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Old Dec 31, 2025 | 03:07 AM
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As blindside has said, it does sound like the key barrel unlock microswitch is sticking. As a test you could try pulling the fuse that supplies that switch and see if the problem goes away, although what else will stop working I don't know.

It's also worth just working your key back and forth in the lock multiple times to try and unstick the switch.
 
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Old Dec 31, 2025 | 05:02 PM
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Okay, while i can understand that the key can be used to raise and lower the top, would the door lock cause the top to go down when the battery is reconnected?
Also, the window for the drivers door will not reset like it is supposed to. It lowers some when you open the door but never goes back up. You have to raise it manually.
Lowering it and raising it to reset it does not work on this car like it is supposed to. Could all of this be related?
 
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Old Jan 1, 2026 | 02:57 AM
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"would the door lock cause the top to go down when the battery is reconnected?" well the door lock causes the top to go down when the battery is connected, so it's logical that it would also happen when the battery is reconnected.

As far as programming the up position on your window, both the window controls and the lock controls are in the Driver Door Control Module, so another possibility is a fault with your module, but start by checking the microswitch as suggested above. But don't simply assume the fault must be the mysterious black box without checking the simple stuff first.
 
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Old Jan 1, 2026 | 06:01 AM
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Hello,
if the Door lock is set to open the Soft Top, he must first open the Window a little bit.
Best Regards, Willi
 
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Old Jan 1, 2026 | 05:01 PM
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I will do a switch check but do you know if the door control module has to be programmed to the the car or can a used one be installed and work without doing any programming? I ask because I have access to a working spare.
 
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Old Jan 2, 2026 | 01:26 AM
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Hello,
I don't know whether another control unit needs to be programmed. Can the soft top be closed using the door lock on this vehicle? This could indicate whether the microswitch is working or stuck in the ‘open position’.
Best regards, Willi
 
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Old Jan 2, 2026 | 03:01 AM
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Originally Posted by Jag_Willi
Hello,
I don't know whether another control unit needs to be programmed. Can the soft top be closed using the door lock on this vehicle? This could indicate whether the microswitch is working or stuck in the ‘open position’.
Best regards, Willi
The door module should be a straight swap - but if the OP is opening the door to get to the module, they may as well test the microswitch while they are in there.

"Can the soft top be closed using the door lock on this vehicle? This could indicate whether the microswitch is working or stuck in the ‘open position’."
Worth checking to see what happens.

Here is Gus's page on the door switches:-

http://jagrepair.com/DoorLatchRepair2000xk8.htm
 

Last edited by dibbit; Jan 2, 2026 at 03:50 AM.
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Old Jan 2, 2026 | 10:14 AM
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"Can the soft top be closed using the door lock on this vehicle? This could indicate whether the microswitch is working or stuck in the ‘open position’."
Worth checking to see what happens.

Excellent suggestion. I will try that. THanks
 
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Old Jan 2, 2026 | 10:55 AM
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We used the key in the driver's door to open the top on a customer car in the Summer when it is 110 F and the car was in the parking lot for hours.
Too hot to get in to drive into the shop.(more like 130 F inside the car)
 
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Old Jan 2, 2026 | 05:41 PM
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Here is the latest. Tell me what you think please

If car is locked by the drivers door key, top does not go down when the battery is connected

If the drivers door is unlocked, the top goes down instantly when the battery is connected unless the drivers door is locked by the key.

If the drivers door is unlocked with the key while the top is up, the top goes all the way down even if you do it quickly. You do not have to maintain the key in this position. If you release the key from the unlock position, the top continues to go the rest of the way down.

If locked with key and held, top comes up but if you don’t keep holding the key, it stops coming up. I believe that is correct for raising the top?

It seems like it is sensing the door key switch, yes? Door module?

Ideas?
Thanks
 
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Old Jan 2, 2026 | 06:04 PM
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Faulty/Sticky latch switch that might need spray cleaning or replacement?
 
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Old Jan 3, 2026 | 12:24 AM
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Hello,
The door control unit seems to be OK. It opens and closes the doors with the key and opens and closes the soft top. So everything is OK. I would check the mechanics, i.e. the three microswitches on the lock. It seems likely that the microswitch for opening the soft top is faulty.
How does it behave when you open the doors with the remote control? Does the soft top open then too?

Best regards, Willi
 
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Old Jan 3, 2026 | 03:17 AM
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Originally Posted by Pantera928
It seems like it is sensing the door key switch, yes? Door module?
Lock barrel switch is still the prime suspect - from your tests it sticks open, unless turned to the lock position. The advice remains the same - test it. You are going to have to take the door card off anyway so you may as well get your multimeter out and see if it is indeed stuck closed. Test either at the microswitch itself or at the connector on the door module. I would lower the window slightly and disconnect the battery before starting.
 
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Old Jan 3, 2026 | 12:59 PM
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FYI, the only way to lock and unlock the car is with the keys. The remote FOB does not seem to work. Might be a battery or a programming issue. Another thing to check but not high on the priority list today. THanks
 
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Old Jan 21, 2026 | 05:13 PM
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Update
If you have the drivers door locked with a the key and reconnect the battery, the top stays up. You can then unlock the car with the key and the top does not try to lower.
If you hold the key in the unlock position, the top will start to lower until you stop holding it in that position and it will stop moving. Vice versa if you hold the key in the lock position. This seems normal to me.
The drivers window will still never reset to the proper up/down positions but will continue to drop a little each time you open the drivers door.
Does this help any of you to have new ideas?
Thanks
 
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Old Jan 21, 2026 | 05:27 PM
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You cannot set the window limitations????
A weak battery will sometimes not hold the set limitations or a faulty door module will not set limitations at all.
 
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Old Jan 21, 2026 | 08:18 PM
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Well, the battery is new nd holds a charge. The passenger door will reset fine. The drivers door will never set much less hold a setting.
I have heard that there is just one door module for both doors and that it is in the drivers door. Any truth to that?
 
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Old Jan 22, 2026 | 09:20 AM
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Figure 15.1 in the electrical guide has a DRIVER'S DOOR MODULE and a PASSENGER DOOR MODULE.
Each door has it's own module.
 
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